The Death of Shelley
Shelley was drowned off Viareggio in 1822 when his boat went down. If I may quote an excellent article in The Guardian: "By 1889 Louis Fournier's celebrated painting "The Cremation of Shelley", showed a miraculously undamaged corpse offered up to Heaven on a martyr's pyre, with Trelawny and Byron striking solemn Romantic poses (actually they went swimming), and a pious Mary kneeling on the wind-swept beach in floods of tears (although in fact she was never there at all)."

Shelley's ashes were interred in the Protestant Cemetery in Rome, although they were missing his heart, which Mary Shelley held onto. The painting below is Shelley's Tomb in the Protestant Cemetery in Rome by Walter Crane (1873).

Except it is actually Keats' gravestone that is shown. Keats had died of TB in Rome in 1821. His epitaph includes the words: "Here lies One Whose Name was writ in Water." Shelley's grave is there but in a different spot, with an epitaph drawn from Shakespeare's The Tempest - highlighted in bold in the quote below:
Full fathom five thy father lies;
Of his bones are coral made;
Those are pearls that were his eyes;
Nothing of him that doth fade,
But doth suffer a sea change
Into something rich and strange...
That is an ancient pyramid at the back left (built between 18 and 12 BC). Others buried here include Goethe's son August, Edward Trelawny (also in the painting at top - he organized Shelley's cremation on the beach and subsequent burial), American painter Elihu Vedder, poet and critic John Addington Symons and that influential Marxist atheist Antonio Gramsci...